From b16fc855a3d1171af18a712dbeb91ab0c1219d0a Mon Sep 17 00:00:00 2001
From: Yixin Dong <ubospica@gmail.com>
Date: Mon, 11 Nov 2024 00:56:50 -0500
Subject: [PATCH] [3rdparty] Update Picojson with const `operator[]` function

This PR adds a `const value& operator[](const std::string& key) const`
method to picojson object
---
 3rdparty/picojson/picojson.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/3rdparty/picojson/picojson.h b/3rdparty/picojson/picojson.h
index 5ecffa9a8f30..69d3045ea554 100644
--- a/3rdparty/picojson/picojson.h
+++ b/3rdparty/picojson/picojson.h
@@ -273,6 +273,10 @@ class object_with_ordered_keys : private std::unordered_map<std::string, value>
     return std::unordered_map<std::string, value>::operator[](key);
   }
 
+  const value& operator[](const std::string& key) const {
+    return std::unordered_map<std::string, value>::at(key);
+  }
+
   void clear() {
     std::unordered_map<std::string, value>::clear();
     ordered_keys_.clear();